How to use in your fleet

Teleporting ships and reclaimers are balanced to be weaker the average vessel, and the Spire Teleporting Leech is (for better or worse) both. They are built with a very specific purpose in life: to capture a ship, and to capture that ship anywhere. One can therefore claim with ease the Snipers, Zenith Bombards, and Sentinel Frigates that are mostly out-of-reach from conventional Parasites. Designate these as preferred targets, or spend some time to manually collect them.

It is not cost-efficient to have these ships engage an enemy fleet head-on. They will die, and the replacement process will be ugly. (NB: To be tested - will Leeches dodge much better with an auto-kiting behaviour set to greater than Fighter/Bomber ranges?) If you take care to send the Leeches only after the battle is half-over (and also utilise the hull bonuses), your economy will be better off.

How to counter when in the AI fleet

An AI unlock will be merely annoying for the player, more out of their ability to teleport past defenses than any innate combat strength. Building Logistics Command Stations Mark III will shut down AI teleportation and adequately eliminate the threat, otherwise read the entry for Teleport Battle Stations.